/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
more details.

You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
**********/
// "liveMedia"
// Copyright (c) 1996-2018 Live Networks, Inc.  All rights reserved.
// MP3 internal implementation details (Huffman encoding)
// C++ header

#ifndef _MP3_INTERNALS_HUFFMAN_HH
#define _MP3_INTERNALS_HUFFMAN_HH

#ifndef _MP3_INTERNALS_HH

#include "MP3Internals.hh"

#endif

void updateSideInfoForHuffman(MP3SideInfo &sideInfo, Boolean isMPEG2,
                              unsigned char const *mainDataPtr,
                              unsigned p23L0, unsigned p23L1,
                              unsigned &part23Length0a,
                              unsigned &part23Length0aTruncation,
                              unsigned &part23Length0b,
                              unsigned &part23Length0bTruncation,
                              unsigned &part23Length1a,
                              unsigned &part23Length1aTruncation,
                              unsigned &part23Length1b,
                              unsigned &part23Length1bTruncation);

#define SSLIMIT 18

class MP3HuffmanEncodingInfo {
public:
    MP3HuffmanEncodingInfo(Boolean includeDecodedValues = False);

    ~MP3HuffmanEncodingInfo();

public:
    unsigned numSamples;
    unsigned allBitOffsets[SBLIMIT * SSLIMIT + 1];
    unsigned reg1Start, reg2Start, bigvalStart; /* special bit offsets */
    unsigned *decodedValues;
};

/* forward */
void MP3HuffmanDecode(MP3SideInfo::gr_info_s_t *gr, Boolean isMPEG2,
                      unsigned char const *fromBasePtr,
                      unsigned fromBitOffset, unsigned fromLength,
                      unsigned &scaleFactorsLength,
                      MP3HuffmanEncodingInfo &hei);

extern unsigned char huffdec[]; // huffman table data

// The following are used if we process Huffman-decoded values
#ifdef FOUR_BYTE_SAMPLES
#define BYTES_PER_SAMPLE_VALUE 4
#else
#ifdef TWO_BYTE_SAMPLES
#define BYTES_PER_SAMPLE_VALUE 2
#else
// ONE_BYTE_SAMPLES
#define BYTES_PER_SAMPLE_VALUE 1
#endif
#endif

#ifdef DO_HUFFMAN_ENCODING
unsigned MP3HuffmanEncode(MP3SideInfo::gr_info_s_t const* gr,
              unsigned char const* fromPtr,
              unsigned char* toPtr, unsigned toBitOffset,
              unsigned numHuffBits);
#endif

#endif
